Hei All, I have search on google about the original license of Ubuntu theme but didn't found it for the example "Ambiance", yes you can got it on internet, but has modified an people release under deferent license, no author contact address etc in its folder. ok just, i need to edit it too

So the package is light-themes and the license is in /usr/share/doc/light-themes/copyright: It's basically CC-BY-SA-3.0 with exceptions for trademarks, logos etc. There are some contact addresses, too.